Why does Bernard go back to the World State? Why does he call Mustapha Mond?

The strange events have overwhelmed Lenina, so she consumes a large amount of soma and falls asleep for nearly eighteen hours. Bernard waits until she is asleep and sneaks off to call His Fordship Mustapha Mond in London to arrange to bring John and Linda back to London. He receives permission and returns to the Reservation to pick them up.